Barking-drum.



H. GUETTLER & W. L. DAVIS.

BARKlNG DRUM.

APPLICATION FILED MAY 2. I916. RENEWED MAY 29.1918.

1 ,272, 945, Patented July 16, 1918* 2 SHEETS-SHEET I. jQ i. v

INVENTOR ATTORNEYS H. GUETTLER & W. L. DAVIS.

BARKING DRUM.

APRLICATION FILED MAY 2. I916. RENEWED MAY 29.1918.

l,272,94:5. I Patented July 16,1918.

2 SHEETS-SHEET 2.

aHozMe W U ITED STA-Tats PATENT oFr cTE.

HERBERT GUE'rrLE t; or CHICAGO, ILLINOIS, AND WILLIAM LLYWELYN DAVIS, 01

' EAU CLAIRE, WISCONSIN.

BARKING-DRUM.

' Specification of Letters Patent.

Application filed May 2, 1916, Serial No. 94,913. Renewed May 29, 1918. Serial No. 237,365,

ments in Barking-Drums; and we do hereby 1O declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

It is possible to remove bark'from logs or blocks of wood preparatory to use of the wood in the paper making industry by tumbling the logs or blocks in a rotating drum which preferably is partially immersed in The drum may be so constructed as to have a plurality of longitudinal slots through which the bark may escape from the drum into the tank, and the wood may be fed continuously into one end of the drum and'discharged continuously from its other end, while the drum is in motion.

It is the object of the present inventionto provide a wood barking drum of special construction and s0 arranged as to facilitate the discharge from the drum of the logs or blocks, and more particularly, the large logs or blocks.

It has been found that in the operation of continuously rotating drums of the type above described, that the larger and heavier logs or blocks have a tendency to stay near the bottom of the cascading pile of wood within the drum, and so are liable to be tumbled longer than is necessary with re.- sultant reduction in the output of the drum,

and with possible danger of unduly shattering the ends of these large pieces or blocks. To accomplish the foregoing object, and others which will be made clear by the following description, the cylindrical wall of the drum is built up out of bars, strips, or the like, which are mounted within and secured to supporting rings, and which at the discharge end of the drum, have a backward curve which gives to the logs or blocks a thrust toward the outlet and so facilitates their'discharge and prevents the accumulation of large and completely treated blocks at the outlet end of the drum and near the bottom of the tumbling pile.

during its rotation.

. The details of the invention are made clear by the following description, which is to be taken in conjunction with the accompanying drawings, wherein- Figure 1 is a side elevation of a drum mountedfor rotation in a tank of water;

Fig. 2 is a sectional elevation on the line 2-2 of Fig. 1;

Fig. 3 is an elevation of the discharge end of the drum;

Fig. at is a side elevation of the discharge end of the drum; and

Fig. 5 is a fragmentary section through the drum.

In the embodiment illustrated, the tank 1. is of concrete with a semi-cylindrical chamber for holding water and with an adjustable dam 2 formed by removable flash boards fitted into grooves in the cement tank and regulating the level of the water. A framework 3 mounted on the tank carries a drive shaft-=1 and countershafts 5 provided with a sprocket wheel 6 and a smooth wheel 7, respectively, over which are passed driving and supporting chains 8 of which three may be used for sustaining the drum in the tank substantially concentric with the body of water contained therein. The countershafts 5 may be mounted in sliding bearing blocks, as illustrated, to equalize the tension on the chains.

Patented July 16, 1918.

At the intake end of the drum is chute 9 leading from a conveyer 10, and'down which wood may be delivered to the drum At the discharge end of the drum, a plurality of planks 11 are removably mounted in guideways formed in the end members of framework 3, as indicated in dotted lines, Fig. 1, and serve to partially close the discharge end of the drum. The height of the woodpile within the drum may be regulated by the number of planks 11 which are in position in the guideway. The drum itself comprises a plurality of flanged rings 12 and a plurality of smooth rings 13 (Fig. 4) over which the three driving and supporting chains 8 may pass, and a pair of guide-rings 14 (Fig. 1)' which are embraced by flanged guide-rollers 15 (Fig. 2) to prevent the drum from swinging or jumping in the tank.

The cylindrical wall of the drum is made of a plurality of bars 16, which, as shown in Fig. 5, may be in the form of angle bars or channels or T-bars, or a combination of bled within the drum, may find exit into the are more easily barked than others.

water of the tank where it is progressively swept out over dam 2 by means of forkshaped paddles 18 attached to the periphery of the drum.

Throughout the greater part of their length, the bars 16 may be straight, but near the discharge end of the drum, they are curved backward with reference to their direction of rotation, and it is this backward curvature that is relied on to effect prompt and complete discharge of thoroughly barked blocks and logs, and more particularly, the heavy pieces, which might otherwise, because .of their weight, be entrapped for a time at the end of the drum.

When the drum is in action, it receives wood continuously from chute 9 and delivers it continuously over the barrier formed of planks 11 and down a' chute 19 to an endless conveyer 20, by which it is taken away for further treatment. The operation is continuous for the bark delivered through the slots is progressively an d'continuously swept out of the tank, and over dam 2, by means of the paddles 18 with which the drum is pro-. vided. The speed with which the pieces of wood travel through the drum can be regulated by changing the height of the barrier at the discharge end of the drum. Rail wood should be tumbled longer than wood that has had its bark loosened by prolonged immersion in water, and some species of wlggld e barking action results mainly from the sliding of the blocks on one another as the pile of wood is caused to cascade within the drum through action thereon of the inwardly projecting flanges of the bars constituting the cylindrical wall of the drum. The blocks move progressively and slowly toward the dis barge end, and as soon as they come under the action of the backwardly curved flanges, they are given an additional thrust longitudinally of the drum, and their c delivery over the barrier isthereby facilitatcd, and there is little or no tendency for the larger and heavler pieces to accumulate at the barrier, as has proved the case when the flanges on the bars do not have the backward bend or curve here contemplated.

7e claim: 1. A barking drum having longitudinal bars with spaces between forming slots for ward to cascade the wood to be barked, said flanges having a backward bend near the discharge end of the drum to facilitate the de-- livery therefrom of the barked wood.

l. A barking apparatus comprising a drum, atank'ln which said drum may rotate partly immersed in water, means for continuously rotating said drum while wood is being fed into the intake end thereof, a barrier retarding the delivery of wood from said drum and baflles within said drum to tumble the wood therein, said ballles having a backward curve near the discharge end .of the drum to facilitate delivery of wood therefrom over said barrier.

5. A barking apparatus comprising a drum, a tank in which saiddrum may rotate partly immersed in water, means for conti'nously rotating said drum while wood to be barked is being fed into the intake end thereof, said drum comprising rings connected by bars which have flanges extending inward to form battles for tumbling the wood as the drum rotates, said flanges extending parallel to the axis of the'drum except near its outlet end where they are curved backward to facilitate the delivery of wood from the drunn-and a barrier partially closing the discharge end of the drum and over which the wood is discharged, substantially as described,

In testimony whereof we have hereto affixed our signatures.

GUETTLER. WILLIAM LLYWELYh DAVIS. 

